Method for treating SO2 in coal firing smoke by red mud

A coal-burning flue gas, SO2 technology, applied in the direction of separation methods, chemical instruments and methods, separation of dispersed particles, etc.

Active Publication Date: 2007-01-24
中铝矿业有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] Solve the problem of red mud accumulation in alumina plant, SO in coal-fired flue gas 2 The resulting problem is still a difficult problem in the industry

Method used

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  • Method for treating SO2 in coal firing smoke by red mud

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The red mud is prepared with water to form a red mud dilution slurry with a liquid-solid ratio L / S (weight ratio) of 10:1, and it is sprayed in the packed absorption tower to contact with the coal-fired flue gas countercurrently to absorb and absorb the coal-fired flue gas SO in 2 . SO in coal combustion flue gas before absorption 2 The concentration is 980mg / m 3 , SO in coal-fired flue gas after absorption 2 The concentration is 190mg / m 3 , the desulfurization rate is 80.6%. When the PH value of the red mud slurry is close to neutral after being recycled and absorbed, the red mud slurry is drained and separated, and the separated desulfurized red mud meets the standards for raw materials for building materials.

Embodiment 2

[0023] The red mud is prepared with water to form a red mud dilution slurry with a liquid-solid ratio L / S of 12:1, and it is sprayed in the packed absorption tower to contact with the coal-fired flue gas countercurrently to absorb and absorb the coal-fired flue gas. SO 2 . SO in coal combustion flue gas before absorption 2 The concentration is 920mg / m 3 , SO in coal-fired flue gas after absorption 2 The concentration is 180mg / m 3 , the desulfurization rate is 80.4%. When the PH value of the red mud slurry is neutral after being recycled and absorbed, the red mud slurry is discharged, settled and separated, and the separated desulfurized red mud meets the standards for being used as a raw material for building materials.

Embodiment 3

[0025] The red mud is prepared with water to form a red mud dilution slurry with a liquid-solid ratio L / S of 15:1, and it is sprayed in the packing absorption tower to contact with the coal-fired flue gas countercurrently to absorb and absorb the coal-fired flue gas. SO 2 . SO in coal combustion flue gas before absorption 2 The concentration is 950mg / m 3 , SO in coal-fired flue gas after absorption 2 The concentration is 160mg / m 3 , the desulfurization rate is 84.2%. When the PH value of the red mud slurry is neutral after being recycled and absorbed, the red mud slurry is discharged, settled and separated, and the separated desulfurized red mud meets the standards for being used as a raw material for building materials.

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Abstract

The present invention relates to waste utilization and coal burning fume purification, and is especially process of eliminating SO2 from coal burning fume with red mud as waste from alumina production. The present invention features red mud is used as absorbent for eliminating SO2 and other harmful gas from coal burning fume. The process includes mixing red mud and water to form dilute red mud slurry of liquid/solid ratio 10-15 to 1, counter flow contacting the dilute red mud slurry with coal burning fume for adsorbing and absorbing SO2 and other harmful gas, exhausting circularly absorbed red mud slurry becoming neutral, and depositing separation to obtain red mud further used as building material. The present invention realizes clean production.

Description

technical field [0001] A method of using red mud to treat SO in coal-fired flue gas 2 The method relates to a method for the utilization of smelting process waste and the purification of coal-fired flue gas, especially the removal of SO in coal-fired flue gas by using red mud, which is a waste of alumina production. 2 Methods. Background technique [0002] Red mud is a waste product produced by the alumina industry. The chemical composition is extremely complex and the alkalinity is very high. The pH value of the attached liquid is greater than 12.5. The comprehensive discharge of sewage is classified as waste water that exceeds the standard. The discharge of red mud is very large, and about one ton of red mud is discharged for every ton of alumina produced. In 2000, the domestic alumina output was 7 million tons, and about 7 million tons of red mud were discharged; in 2005, the domestic alumina output was 8.5 million tons, and about 8.5 million tons of red mud were discha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/80
Inventor 王熙慧吕子剑吴钢吴红应黄健何静华安松琦郭显锋张剑辉李春潮张育新海胜利朱花芬
Owner 中铝矿业有限公司
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